B.1.3.1 SPARC: The SunOS/BSD Source Compatibility Package

If this software package is installed, it supports some of the SunOS/BSD
commands that are not included in, or have changed in, the SunOS 5.x system
software. Application source code that is compliant with the SunOS 4.x environment
will compile and run under the Solaris 2.5 environment by using the SunOS/BSD
Source Compatibility package.